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diff --git a/spec/bundler/bundler/yaml_serializer_spec.rb b/spec/bundler/bundler/yaml_serializer_spec.rb
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+++ b/spec/bundler/bundler/yaml_serializer_spec.rb
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+# frozen_string_literal: true
+require "spec_helper"
+require "bundler/yaml_serializer"
+
+RSpec.describe Bundler::YAMLSerializer do
+  subject(:serializer) { Bundler::YAMLSerializer }
+
+  describe "#dump" do
+    it "works for simple hash" do
+      hash = { "Q" => "Where does Thursday come before Wednesday? In the dictionary. :P" }
+
+      expected = strip_whitespace <<-YAML
+          ---
+          Q: "Where does Thursday come before Wednesday? In the dictionary. :P"
+      YAML
+
+      expect(serializer.dump(hash)).to eq(expected)
+    end
+
+    it "handles nested hash" do
+      hash = {
+        "nice-one" => {
+          "read_ahead" => "All generalizations are false, including this one",
+        },
+      }
+
+      expected = strip_whitespace <<-YAML
+          ---
+          nice-one:
+            read_ahead: "All generalizations are false, including this one"
+      YAML
+
+      expect(serializer.dump(hash)).to eq(expected)
+    end
+
+    it "array inside an hash" do
+      hash = {
+        "nested_hash" => {
+          "contains_array" => [
+            "Jack and Jill went up the hill",
+            "To fetch a pail of water.",
+            "Jack fell down and broke his crown,",
+            "And Jill came tumbling after.",
+          ],
+        },
+      }
+
+      expected = strip_whitespace <<-YAML
+        ---
+        nested_hash:
+          contains_array:
+          - "Jack and Jill went up the hill"
+          - "To fetch a pail of water."
+          - "Jack fell down and broke his crown,"
+          - "And Jill came tumbling after."
+      YAML
+
+      expect(serializer.dump(hash)).to eq(expected)
+    end
+  end
+
+  describe "#load" do
+    it "works for simple hash" do
+      yaml = strip_whitespace <<-YAML
+        ---
+        Jon: "Air is free dude!"
+        Jack: "Yes.. until you buy a bag of chips!"
+      YAML
+
+      hash = {
+        "Jon" => "Air is free dude!",
+        "Jack" => "Yes.. until you buy a bag of chips!",
+      }
+
+      expect(serializer.load(yaml)).to eq(hash)
+    end
+
+    it "works for nested hash" do
+      yaml = strip_whitespace <<-YAML
+        ---
+        baa:
+          baa: "black sheep"
+          have: "you any wool?"
+          yes: "merry have I"
+        three: "bags full"
+      YAML
+
+      hash = {
+        "baa" => {
+          "baa" => "black sheep",
+          "have" => "you any wool?",
+          "yes" => "merry have I",
+        },
+        "three" => "bags full",
+      }
+
+      expect(serializer.load(yaml)).to eq(hash)
+    end
+
+    it "handles colon in key/value" do
+      yaml = strip_whitespace <<-YAML
+        BUNDLE_MIRROR__HTTPS://RUBYGEMS__ORG/: http://rubygems-mirror.org
+      YAML
+
+      expect(serializer.load(yaml)).to eq("BUNDLE_MIRROR__HTTPS://RUBYGEMS__ORG/" => "http://rubygems-mirror.org")
+    end
+
+    it "handles arrays inside hashes" do
+      yaml = strip_whitespace <<-YAML
+        ---
+        nested_hash:
+          contains_array:
+          - "Why shouldn't you write with a broken pencil?"
+          - "Because it's pointless!"
+      YAML
+
+      hash = {
+        "nested_hash" => {
+          "contains_array" => [
+            "Why shouldn't you write with a broken pencil?",
+            "Because it's pointless!",
+          ],
+        },
+      }
+
+      expect(serializer.load(yaml)).to eq(hash)
+    end
+
+    it "handles windows-style CRLF line endings" do
+      yaml = strip_whitespace(<<-YAML).gsub("\n", "\r\n")
+        ---
+        nested_hash:
+          contains_array:
+          - "Why shouldn't you write with a broken pencil?"
+          - "Because it's pointless!"
+          - oh so silly
+      YAML
+
+      hash = {
+        "nested_hash" => {
+          "contains_array" => [
+            "Why shouldn't you write with a broken pencil?",
+            "Because it's pointless!",
+            "oh so silly",
+          ],
+        },
+      }
+
+      expect(serializer.load(yaml)).to eq(hash)
+    end
+  end
+
+  describe "against yaml lib" do
+    let(:hash) do
+      {
+        "a_joke" => {
+          "my-stand" => "I can totally keep secrets",
+          "but" => "The people I tell them to can't :P",
+        },
+        "more" => {
+          "first" => [
+            "Can a kangaroo jump higher than a house?",
+            "Of course, a house doesn't jump at all.",
+          ],
+          "second" => [
+            "What did the sea say to the sand?",
+            "Nothing, it simply waved.",
+          ],
+          "array with empty string" => [""],
+        },
+        "sales" => {
+          "item" => "A Parachute",
+          "description" => "Only used once, never opened.",
+        },
+        "one-more" => "I'd tell you a chemistry joke but I know I wouldn't get a reaction.",
+      }
+    end
+
+    context "#load" do
+      it "retrieves the original hash" do
+        require "yaml"
+        expect(serializer.load(YAML.dump(hash))).to eq(hash)
+      end
+    end
+
+    context "#dump" do
+      it "retrieves the original hash" do
+        require "yaml"
+        expect(YAML.load(serializer.dump(hash))).to eq(hash)
+      end
+    end
+  end
+end